Got a buggy log here:
https://www.wildstarlogs.com/reports/8L3mT4D9qQY7fbM2#fight=56&type=resources&hostility=1&sourceclass=Any
https://www.wildstarlogs.com/reports/wrmWBjLGYDnHygtX#fight=35&type=resources&hostility=1
I believe its the same for this log too, as it shows the double health of boss, as well as the vertical drop and rise again in the damage graph, present in the other examples.